/*
 * Copyright (c) 2010-2025. Axon Framework
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.axonframework.integrationtests.testsuite.course.module;

import org.axonframework.commandhandling.annotations.CommandHandler;
import org.axonframework.eventhandling.gateway.EventAppender;
import org.axonframework.eventsourcing.annotations.EventSourcingHandler;
import org.axonframework.eventsourcing.annotations.EventSourcedEntity;
import org.axonframework.eventsourcing.annotations.reflection.EntityCreator;
import org.axonframework.modelling.annotations.InjectEntity;

import java.util.List;

class CreateCourseCommandHandler {

    @CommandHandler
    void handle(
            CreateCourse command,
            @InjectEntity(idProperty = "courseId") State state,
            EventAppender eventAppender
    ) {
        var events = decide(command, state);
        eventAppender.append(events);
    }

    private List<CourseCreated> decide(CreateCourse command, State state) {
        if (state.created) {
            return List.of();
        }
        return List.of(new CourseCreated(command.courseId()));
    }

    @EventSourcedEntity(tagKey = "Course")
    static final class State {

        private boolean created;

        @EntityCreator
        private State() {
            this.created = false;
        }

        @EventSourcingHandler
        private State apply(CourseCreated event) {
            this.created = true;
            return this;
        }
    }
}
